A275259 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-1), (-2,1) or (-1,-1) and new values introduced in order 0..2.

1, 9, 128, 2564, 126420, 14005180, 3224773976, 1565667773372, 1622686746762908, 3362812964412060544

Offset

1,2

Comments

Diagonal of A275266.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..0..1..0..1. .0..1..0..0. .0..1..0..2. .0..1..0..2. .0..1..2..1
..0..1..0..1. .0..1..2..2. .0..2..0..1. .0..1..2..1. .2..1..2..0
..2..1..0..1. .2..1..2..1. .0..2..0..1. .0..1..0..1. .2..1..0..0
..0..1..0..1. .2..1..0..1. .0..1..0..1. .2..1..2..1. .2..1..2..1

Crossrefs

Cf. A275266.

Sequence in context: A073014 A046754 A203425 * A064746 A232950 A184143

Adjacent sequences: A275256 A275257 A275258 * A275260 A275261 A275262

Keyword

nonn

Author

R. H. Hardin, Jul 21 2016

Status

approved